Prime Factors Calculator  20 digits!

This fast factoring calculator is written entirely in JavaScript.
Unlike many other JavaScript calculators, it does not have
the usual 16-digit limit (up to 253 = 9007199254740992, hence 16 digits only).
Here, you can factor 20-digit numbers.In modern browsers, this calculator does most factorizations within a second. In rare worst-case scenarios
(for some large semiprimes with 10-digit factors)
factorizations might take a couple of minutes. Enjoy!